3 years ago

QUICK!! TEN POINTS AND BRAINLIEST FOR WHOEVER GETS IT RIGHT!

Mathematics

1 answer:

grigory [225]3 years ago

8 0

Answer:

3 units

I counted the spaces XD lol good luck

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What is the simplest form of √324x^6y^8?

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Step-by-step explanation:

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18x³y⁴

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3 years ago

What is the length of the side opposite the 30° angle? HELP

Rom4ik [11]

The answer is B
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3 years ago

A study of long-distance phone calls made from General Electric Corporate Headquarters in Fairfield, Connecticut, revealed the l

lesya692 [45]

Answer:

The probability that a call last between 4.2 and 4.9 minutes is 0.4599

Step-by-step explanation:

Let X be the length in minutes of a random phone call. X is a normal distribution with mean λ=4.2 and standard deviation σ=0.4. We want to know P(4.2 < X < 4.9). In order to make computations, we will use W, the standarization of X, given by the following formula

$W = \frac{X-\mu}{\sigma} = \frac{X-4.2}{0.4}$

We will use $\phi$ , the cummulative distribution function of W. The values of $\phi$ are well known and the can be found in the attached file

$P(4.2 < X < 4.9) = P(\frac{4.2-4.2}{0.4} < \frac{X-4.2}{0.4} < \frac{4.9-4.2}{0.4}) = P(0 < W < 1.75) = \\ \phi(1.75) - \phi(0) = 0.9599-0.5 = 0.4599$